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| author | Matt Sealey <matt.sealey@arm.com> | 2019-03-07 16:30:33 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-03-07 18:32:02 -0800 |
| commit | 433b3b3d9f642e37b270cd29aef53cee75ef4a05 (patch) | |
| tree | 4d575729477e87311df6831c305341b95e7dacef /lib | |
| parent | 95777591d07e08ebb95bb373237fcfbf54fcbf5c (diff) | |
| download | lwn-433b3b3d9f642e37b270cd29aef53cee75ef4a05.tar.gz lwn-433b3b3d9f642e37b270cd29aef53cee75ef4a05.zip | |
lib/lzo: 64-bit CTZ on arm64
LZO leaves some performance on the table by not realising that arm64 can
optimize count-trailing-zeros bit operations.
Add CONFIG_ARM64 to the checked definitions alongside CONFIG_X86_64 to
enable the use of rbit/clz instructions on full 64-bit quantities.
Link: http://lkml.kernel.org/r/20181127161913.23863-5-dave.rodgman@arm.com
Link: http://lkml.kernel.org/r/20190205141950.9058-3-dave.rodgman@arm.com
Signed-off-by: Matt Sealey <matt.sealey@arm.com>
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Markus F.X.J. Oberhumer <markus@oberhumer.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <nitingupta910@gmail.com>
Cc: Richard Purdie <rpurdie@openedhand.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Cc: Sonny Rao <sonnyrao@google.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/lzo/lzodefs.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/lzo/lzodefs.h b/lib/lzo/lzodefs.h index 497f9c9f03a8..00d1080155e4 100644 --- a/lib/lzo/lzodefs.h +++ b/lib/lzo/lzodefs.h @@ -25,7 +25,7 @@ #if defined(__BIG_ENDIAN) && defined(__LITTLE_ENDIAN) #error "conflicting endian definitions" -#elif defined(CONFIG_X86_64) +#elif defined(CONFIG_X86_64) || defined(CONFIG_ARM64) #define LZO_USE_CTZ64 1 #define LZO_USE_CTZ32 1 #elif defined(CONFIG_X86) || defined(CONFIG_PPC) |